Panic attacks don't make you zone out for 3 hours then come to, and they generally don't last long. Panic attacks don't cause a person to forget what happened, in fact, they are fully aware of the entire incident.
Any nurse who told you this was a panic attack needs her license revoked, but we don't really know what you told her either for sure. If you told her everything you've told us, and nothing differing, there is no way she would conclude this as a panic attack.
You most likely had a seizure.
Or, you told the nurse you have anxiety, that you recall having an attack, and then don't recall anything after that for a few hours later: IOW you had one and knocked yourself out in a panic. Your mother would also more than likely be privy to the fact that you have anxiety disorder. Perhaps you are leaving out this information and it makes it all appear mysterious.
What are these cards you're talking about? It seems to be added in for some reason, perhaps for more "effect."